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That shot is pretty good considering it's your first.
There is tilt in your focal plane that's why the stars are out of focus to the left of the fiels and sharper to the right. This is because a 300mm lens starts to weight a little and it doesn't keep square to the sensor plane when the camera point at different parts of the sky. That and that stars are point light sources so not forgiving on focus and field correction. You could remedy to that by bracing the lens in a centering ring to hold its weight.
If you want to get a refractor and a mono camera then you don't have to get an APO. Because you'll be focusing different colours independently. If you still want to use an OSC like this camera then get an APO which is better color corrected.
If you want to do narrowband that means long exposures, good tracking and auto-guiding so now it's bigger $ because you'll need a good equatorial mount.
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